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I've done that, and so has our Gas Engineer. Nothing is faulty. It's either resonance/frequency or the hot water pipes.

Hi Wayne - thanks for your reply. Why do you say to take the cover off? Do you mean leave it off? Or take it off to listen for the cause?

Boiler: Potterton Promax Combi HE Plus 28 Issue: Intermittently, there is a vibrating/knocking noise AFTER the heating cycle has completed but BEFORE the boiler shuts down. No error codes. This only happens on occasion. Watch the video by clicking here (via my YouTube) Is it the heating...